package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> queryListWithTree() {

        List<CategoryEntity> categoryEntities = baseMapper.selectList(null);
        List<CategoryEntity> parent = categoryEntities.stream().filter(categoryEntity -> categoryEntity.getParentCid() == 0).map((menu)->{
            menu.setChildren(getChildrenList(menu,categoryEntities));
            return menu;
        }).sorted((menu1,menu2)->{
            return menu1.getCatLevel()-menu2.getCatLevel();
        }).collect(Collectors.toList());

        return parent;
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);

        return parentPath.toArray(new Long[0]);
    }

    private List<Long> findParentPath(Long catelogId,List<Long> paths){
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if(byId.getParentCid()!=0){
            findParentPath(byId.getParentCid(),paths);
        }
        return paths;

    }


    private List<CategoryEntity> getChildrenList(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter((categoryEntity) ->
                categoryEntity.getParentCid().equals(root.getCatId())
        ).peek(categoryEntity -> categoryEntity.setChildren(getChildrenList(categoryEntity,all))).sorted((menu1, menu2)->{return menu1.getSort()-menu2.getSort();}).collect(Collectors.toList());

        return children;
    }
}